DISTRIBUTION OF 3 EARTHQUAKE RUPTURE ZONES IN ESATERN TIENSHAN AND ITS RELATIONSHIP WITH 2 HISTORICAL EARTHQUAKES

doi:10.3969/j.issn.0253-4967.2016.01.006

Abstract

Abstract:

The distribution of earthquake rupture zone plays a very important role in determining location of epicenter and magnitude of historical earthquake. There is still argument about the seismogenic structure of the 1842 M7 Balikun earthquake and the 1914 M7 1/2 Balikun earthquake in the historical records in eastern Tienshan. Through field geological survey, we confirm that there exist 3 rupture zones in Eastern Tienshan. These rupture zones, Tazibulake rupture zone on the Jian Quanzi-Luo Baoquan Fault, north of Shanshan, Xiong Kuer rupture zone on the south Balikun Basin Fault and Yanchi rupture zone on the south Yiwu Basin Fault, are closely related to 2 historical earthquakes. Based on historical literature and current geological evidence analysis, we infer that Xiong Kuer rupture zone was produced by 1842 M7 earthquake and Yanchi rupture zone by 1914 M7 1/2 earthquake, while Tazibukale rupture zone may represent another unrecorded historical event. South Balikun Basin Fault disturbs Quaternary stratigraphy which has a ¹⁴C age of 3110±30 B.P in the south of Balikun County, ~100km to the east of Xiong Kuer rupture zone, therefore we can't preclude the possibility that Xiong Kuer rupture zone extends to the south of Balikun County. This region overlaps with the meizoseismal area based on the literature document, together with the fact that the impact of 1842 earthquake is no less than 1914 earthquake, we believe that the magnitude of 1842 earthquake is no less than that of the 1914 earthquake.

Key words: Eastern Tienshan, Balikun, historical earthquake, epicenter, rupture zone, magnitude

摘要：

查明地表破裂带的展布对确定历史地震震中位置和震级大小有着十分重要的意义。东天山地区历史记载有1842年巴里坤附近的7级地震和1914年巴里坤附近的7 1/2级地震,发震构造存在争议。通过野外地质调查,确认东天山存在3条与这2次历史地震相关的地表破裂带,即碱泉子-洛包泉断裂上的鄯善北塔孜布拉克地表破裂带,巴里坤盆地南缘断裂上的雄库尔地表破裂带以及伊吾盆地南缘断裂上的盐池破裂带。综合该地区历史地震文字记录和目前的研究程度分析,认为雄库尔地表破裂带可能与1842年地震相关,而盐池破裂带则与1914年地震相关,塔孜布拉克破裂带可能代表了1次漏记的历史强震。在雄库尔破裂带以东约100km的巴里坤县城南发现巴里坤盆地南缘断裂干扰的堆积地层年龄为(3110±30)a,据此我们不能排除雄库尔地表破裂带延伸至巴里坤县城南一带的可能性。该区域位于文字记载的极震区之内,加之文字记载的1842年地震的影响范围不小于1914年地震,认为1842年地震震级不应小于1914年地震。

关键词: 东天山, 巴里坤, 历史地震, 地震震中, 地表破裂带, 震级

CLC Number:

P315.2

WU Fu-yao, RAN Yong-kang, CHEN Li-chun, LI An. DISTRIBUTION OF 3 EARTHQUAKE RUPTURE ZONES IN ESATERN TIENSHAN AND ITS RELATIONSHIP WITH 2 HISTORICAL EARTHQUAKES[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(1): 77-90.

吴富峣, 冉勇康, 陈立春, 李安. 东天山三条地震地表破裂带的展布及其与两次历史地震的关系[J]. 地震地质, 2016, 38(1): 77-90.

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